Grating



F. TENCH 2,155,694

GHATING April 25, 1939.

Filed July 24, 1937 edemzsir.

Patented Apr. 2s, 1939 l 2,155,694

4UNITED STATES PATENT ori-ICE uname Frederick Teneh, White Plaim, N. Y.,assigner so L. 'l'. Corporation, a corporation of New ersey ApplicationJuly 24, 1937, Serial No. 155,379

8 Claims. (Ci. 18S-$2) This invention relates to metallic gratings par-In the accompanying drawing showing a practicularly adapted for use assidewalk or floor tical illustration of the invention: gratings andwhich comprise a plurality of spaced Fig. 1 is a perspective view of aportion of the bearing members to which a plurality of spaced completedgrating.

crossing members are welded or otherwise se'- Fig. 2 is an enlarged endelevation of a portion -5 cured thereto to form a completed rigidstructhereof. ture. Fig. 3 is a side elevation thereof.

The principal object oi the invention yis the Referring in detail to thedrawing in which a production of agrating having a minimum weightpractical embodiment of the invention is illus- 10 of material with amaximum of strength. trated: 10

A further object of the invention is the pro- The web portions of thebearing bars are induction of a grating of the character above dedicatedat i while 2 indicates the head portions scribed in which the partsemployed therefor thereof. These bearing bars comprise fiat thinpreferably are standard ones, such, for instance, metallic plates ofstandard size and form and the as ordinary bars and rods of standarddimenhead members 2 thereof are produced by bending l5 sions, so that nospecial manufacture or rolling around or lapping or folding over onthemselves of the parts making up the finished structure and preferablyinto engagement therewith the is necessary. g upper ends of said platesto form the member By preference, the bearing or longitudinalillustrated whereby the heads 2 comprise a double members of my improvedgrating comprise comthickness oi' metal. During the bending and fold- 20paratively thin metal plates or bars disposed on lng operationlongitudinal shoulders 2 are proedge so as to provide a maximum ofresistance duced which lie Vadjacent the free edges of the to forceapplied under compression. The upper bent ends of the web as shown inthe drawing. edges of said bearingbars are preferably bent Said heads 2each has an upper curved or around or lapped or folded over onthemselves in rounded edge or surface, the apex of which is 25 themanner to be presently described and as in vertical alignment with thecentral vertical illustrated to provide a rounded enlargement on planeof the web I of the bearing bar to Produce the upper edge therebyproducing or securing a balanced symmetrical member of stable equaliamodified form of 'r-bar without the employbrium. 'I'hese bearing bars orlongitudinal memment of a specially rolled bar. This rounded bers arepreferably cililidiStS-Dtly SDB-ccd apart 30 enlargement or head notonly considerably infrom cach other and crossingy members compriscreasesthe strength of the bearing member 1ting rods or bars l of standardconstruction and self but also provides an abundance of mate. size arewelded or otherwise secured transversely rial for-the welding of thecrossing members 'thereto Bt Spoccd distances Preferably by the ythereto and appreciably facilitates the welding clcctliccl resistancewelding method. The elec- 36 operation. The head or enlargement,especially tricl Welding is effected in such manner that in the ease of9, sidewalk grating, obviously need the crossing rods or members 3 areembedded in be onlyon the upper edge of thebar or plate the heads of thebearing bars with the exception and the lower edge may be an integralpart oi' of B- mi] Dart only which 1166 in c Pla-ne Slightly o and ofuniform cross-section with the body -or above the upper surfaces of theupper edges 40 web portion of the member. It has been found 0f thc DiccS01' the hcd of said bearing bars in practice that under compression thebearing t0 thereby provide l l10n-.Slip treed in thc nmember without ahead is susceptible to twistished Productw ing or buckling under greatstress but these dis- It Will be obvious from tiliv cboVc descriptionadvantages have been eliminated by the present that the Hating Producedaccording t0 the in- 45 invention. I have also found that when the pres-Vcntion may be tcl'mcd l Soif-cleaning" One ent construction is employedit has been found for the reason that the rounded heads 2 of thefeasible to eliminate a large number of bearing bearing bots und `therounded crossing 0l' trans- `bars which would ordinarily be necessary,thereverse members I provide surfaces over which by decreasing theweight of the completed strucdirt or other foreignV matter Will easilySlide 50 ture without sacrificing any of its strength.V Also downwardlyintermediate the interstices formed by providing a head I have found itpossible to by the bearing bars and the crossing members. employ a smallor thin gauge of metal bar which Furthermore, the heads of said bearingbars also appreciably decreases the weight of the comprovide a shieldfor the web portions thereof so pleted structure. that 'dirt or foreignmatter passing through the u the welding operation which obviously wouldbeobjectionable. Also the increase of welded mass afforded by theenlargement of the bearing bars at their upper edges is useful inproviding addi-v tional strength at this point where the grating may becalled upon to resist twisting and bending forces, and as alreadyindicated, it avoids the weakening effect which would result from usinga thin plate having no reinforcement at the edge where the weld is to beformed.

The bearing members constructed in the manner described are employed toproduce a modiiied form of T-bar in order to obviate the expense of aspecially rolled T-bar although it will be under- Y shoulder on each ofsaid webs positioned in juxtastood that the employment of a rolled T-barfor the bearing members is within the scope of my invention.

It will also be apparent that the structure described and claimed may beused in metallic structures other than gratings.

The invention claimed is:

1. A metallic grating provided with a plurality of spaced bearing barscomprising plates set on edge with the upper ends lapped or bent over toprovide heads having a double thickness of metal each having a free edgelying adjacent the bearing bar and a. plurality of spaced crossing rodswelded to said heads.

2. A metallic grating comprising -a plurality of spaced plates formingbearing bars set on edge with their upper ends folded over to provideheads having rounded surfaces the apices of which lie substantially inalignment witha vertical plane taken through the centers of said platesand spaced crossing members embedded in andelectrically welded to saidheads.

3. A metallic structure provided with a plurality of spaced bearing barscomprising plates each having a web and a head integral therewith, saidheads overhanging said webs and being formed by bending over the upperends of said plates to form a plurality of thicknesses of metal insubstantial parallelism and spaced crossing members welded to the headsof said bearing bars.

4. A metallic structure provided with a plurality of spaced bearingplates each having a web and a head integral therewith, said heads beingrounded on their upper surfaces and overhanging said webs and beingformed by lapping over the upper ends of said plates into engagementwith the webs andspaced crossing rods embedded in and electricallywelded to said heads.

5. A metallic structure provided with a plurality of spaced longitudinalbars of substantially the same width and depth throughout their lengthsand each including a web member and an enlarged head integral therewith,said heads comprising the ends of said webs and being formed by lappingover the ends of said webs whereby said heads are formed of a pluralityof thicknesses of the metal of said webs and spaced crossing memberswelded to the heads of said longitudinal bars,

6. A metallic structure provided with a plurality of spaced longitudinalmembers comprising plates each having a web and a head integraltherewith consisting of a lapped 'over end of the web, a

positionv tota free end ofA said webs and spaced crossing members weldedto the heads of said l'longitudinal members.

Y ping over theends of -said webs whereby said heads are formed yofa-plurality of thicknessesof the metal of said webs positioned-insubstantial parallelism with each other and spaced crossing memberswelded to the heads of said longitudinal 8. A metallic structureprovided with a plurality oi spaced longitudinal bars of substantiallythe -same width and depth throughout their lengths

